launch/policy: be more explicit in map-selection
launch/policy: be more explicit in map-selection

Rather than passing in the group policy as fallback, use NULL as
fallback and check for group-policies explicitly. This makes misbehavior
more obvious, since we will no longer end up putting them silently into
the group policies.

Signed-off-by: David Herrmann <fb53b2ddb8d141e0cb39d7c67c2f81b6bc2eb0f7@gmail.com>

bus1/dbus-broker